That's probably a driver issue and not Flash. try reinstalling your driver, or maybe go to the previous one instead. Also there is a thing called the Feel it driver on Wacom's site that might work for you.
I am having the exact same problem, and reinstalling the driver doesn't help at all.
Can you please try with the latest Flash Professional CC 2015 version.
Also please let us know which Wacom tablet you are using?